#include <stdio.h>

int SumToNum(int start, int end)
{
  int sum = 0;

  for (int i = start; i <= end; i++)
  {
    sum += i;
  }


  return sum;

}


int main()
{
  int start = 1;
  int end = 100;
  int sum = SumToNum(start, end);

  printf("sum = %d\n", sum);


  return 0;
}
